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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '95743aa9678885c5429e8ce585280dd437d45710d280ad56e6c501acd7086341' 
  AND token = 'coL8Hu0t+VkwAiDnvsJUdmKlv26b1r0Rjfnp4ap1hbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}